<template>
 <!-- <span :class="{iconfont:item.iconText}"></span> 动态属性class 的使用方法 -->
  <div class="my-tab-bar">
  	<div class="tab-item"
     v-for="(item,index) in arr"
      :key="index"
      :class="{current:index===color }"
      @click="btnFn(index,item)">
      <!-- 图标 -->
      <span class="iconfont" :class="item.iconText"></span>
      <!-- 文字 -->
      <span>{{item.text}}</span>
    </div>
  </div>
</template>

<script>
export default {
  data () {
    return {
    color:0  
    }
  },
  props:{
    arr:Array,
    required:true,//判断是否传值  为ture没穿就报错
    //自动校验
  validator(value){
if(value.length>=2&&value.length<=5){
return true
}else{
  console.log('数据源必须是2-5');
  return false
}
  }
  },
  methods:{
  btnFn(index,item){
     this.color=index
     this.$emit('chengFn',item.componentName)

   }
  }
}
</script>

<style lang="less" scoped>
.my-tab-bar {
  position: fixed;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 50px;
  border-top: 1px solid #ccc;
  display: flex;
  justify-content: space-around;
  align-items: center;
  background-color: white;
  .tab-item {
    display: flex;
    flex-direction: column;
    align-items: center;
  }
}
    
.current {
  color: #1d7bff;
}
</style>